Pump



A. S. WELDY May 21, 1929.

PUMP

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PUMP

Filed nec. 21, 1927 2` sheets-sheet 2 I /NvENToR ATTORNEY PATENT OFFICE.

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' l Applicativi illed December 21, 1927. Serill N0. 241,650.

kMy invention relates'to pumps, and particularly to pumps of that class which have rate at `vvhi a cylinder or rotor provided with two or more pistonuipped cylinders disposed in balanced relation and parallel to the axis of rotation.

It relates particularly to Aa unitary device of this character adapted to pump a plurality of dierentlliquids, and in which the rate of pumping any liquid may be very minutely regplated independently of the c any of' the other liquids is pumped. y

The objects of my invention are 4to provide a pum of this character which is inherently ba anced and which may be operated at very hi h speeds without noise or vibration. Anot er object of my invention is to provide a pump of this character, comprising a single unitwhich will be adapted to ump a pluralityo dierent liquids ,or which, 1f desired, may be adapted to pump the same liquid at different rates to several discharge points. Another object of my in- 4vention is to provide a device of this character which is susceptible of minute regulation so that it may be set to accurately discharge a liquid at any predetermined rate from zero up to the capacity of the pump. A furtherobject 01Ev my invention is to provide a device of this character in which the dischar e rate of any of the li uids being um lpendently of the rate at which any of the other liquids are being discharged.

Witlf. these objects in view my invention includes the novel elements and combinations of elements described below and illustrated in the accompanying typical drawings in'vvhichl Fig. l is a fragmentary front View, par tially in section, of my pump;

Fig. 2 is a section of Fig. 1 in the plane 2 2;

Fig. 3 is an inside elevation view ci the cover plate;

Fig. 4 is a section cf Fig. 3 in the plane ll-4;

llig. 5 is an elevation view ot the adjustable cam plat/es; and

Fig. 6 is a section of the cam plates in the plane 6-6 of Fig. 5 showing how these plates are movable relative to each other.

Referring to the drawings, my pump cornprises a cylindrical cup-,like casing, 1, provided at the open end with the denge, 2, and

may be minutely regu ated inde-- having suitable supports, 3 and 4. This casing is adapted to be closed by the cover plate 5, which is secured to the flange by means of the bolts, 6. The cover plate is provided with a center openin ,7, which forms a bearing for the rotor sha t, 8. The inner side of the cover plate, 5, is provided with circumferential grooves or channels, 8, 9, 10, 11, 12 and 13, the function of which will be explained later. These grooves communicate with holes, 14, 15, 16, 17, 18 vand 19, which extend entirely through the cover plate and are threaded to receive pipes, as shown at 20, 21 and 22 in Fig. 3.A

Preferably integral with the shaft, 8', is the rotor, 23. This rotor ma be of any size and may carry any number. o pairs of pumping units, each palr of which is symmetrically .disposed relative' to the axis of rotation. For the purpose of illustration I have shown only three pairs of pumps.

Referring to Figs. 1 and 2, symmetrically disposed hols, 24 and 25, 26 and 27, and 28 and 29, respectively, are drilled or bored in the rotor parallel with the axis of rotation and which form the cylinders of the pump. From the rear of the rotor these holes are enlarged by counterboring as shown at 30, 31, 32 and 33, to receive the pistons, 34, 35, 36 and 37, respectively. These pistons are provided with plungers, 38, 39, and 41, respectively, which reciprocate in the cylinders, 24, 25, 26, 27, 28 and 29, and form the pistons or plungers proper for the pump. Each of the pistons, 34, 35, 36 and 37, is hollowed out to form an annular space about its plunger, and ar helical spring, such as 42 or 43, surrounds each of the plungers, 38, 39, 40 and 41, and is compressed between the bottom of the counterbore and the piston. These springs tend to retract the plungers from their' respective cylinders.

At the back of the casing behind the rotor are the cam plates, 44, 45 and 46. ylhe center cam plate, 46, is circular and the cam plates exterior of that are annular rings. These plates are mounted upon the axis or shaft, 47, which extends centrally through all of the plates and through the exterior of the casing, 1, Where it is secured in place by means of lool'. nuts, 48 and 43. It will be thus apparent that the com plates, within the spacelimited.

by the rear o the casing and the rear of the rotor, may be tilted about the shaft, 47, so that the angle of inclination of the cern platee to the axis ot rotation may be varied.

Threaded .through the rear easing er/all and bearing againsteach cani plate on opposite sides of the axis, 47, are adJusting screws, 50 and 51, for the cam plate, 44; 52 and 53, for the cam plate, 45; and 54 and 55, for the cam plate, 46. These screws are also provided with lock nuts, 56, which secure them in adjusted position. It will be evident that the inclination of cam plate. 44, may be varied by moving serews,'50 and 5l, in opposite directions to each other, and in the same way the inclination of each of the other cani plates may be. varied. Where space is essential, the circumferential surfaces of the cam plates which are close together must be spherical, but where space is not ,essential and the cam plates can be separated somewhat, these surfaces may be cylindrical. This will be particularly apparent from a consideration of Fig. 6 which illustrates the cam plates set at different angles to each other and to the axis of rotation.

The bottoms of the pistons, 34, 35, 36, 37, etc., are provided with projections terminating in balls, 57, about which are spun the conical cups, 58, which bear upon the cam plates. These balls and the conical cups provide ball and socket joints adapted for universal movement as the rotor is turned.

The'rotor, 23, fits closely against the inner side of the cover plate, and the channels or grooves, 8, 9, 10, 11, 12 and 13, on the inside of the cover plate, areA adapted to register with the paths described by the open ends of the pumping cylinders, 24, 25, 26, 27, 28,

29 in the rotor. In other words, the cylinder, 24, for example, depending upon whether the plunger, 38, is being retracted or compressed in the cylinder, will tend either to draw liquid from the groove, 8, and discharge into the groove, 9, or draw from the groove, 9, and discharge into the groove, 8. These grooves should be as nearly 180 degrees in extent as is possible. y

The operation of my device is as follows: The rotor-may be turned in either direction. If it turns in the direction of the arrow shown in Fi 1 and the cam plates are in the position s own in Fig. 2, it will be apparent that plunger, 41, forexample, as the rotor turns 180 degrees, will be retracted in cylinder, 25, until it occupies the position of the plunger, 38. During this retraction, cylinder, 25, registers with groove, 9, and any liquid which 1s 1n that groove will flow or be drawn into cylinder, 25. As the cylinder, 25, passes over the top dead center its opening comes into registration with roove, 8, and any liquid in cylinder, 25, will e forced outwardly into roove, 8, by plunger, 41, until ,the bottom dea center is reached. Here, groove, 8, ends, and cylinder, 25, immediately passes over into registration with groove, 9, to repeat the cycle. It

will be apparent that each of the cylinders will pump and discharge into the respective grooves inA the 'same manner. This being so,

liquids :are introduced through the openings, 15, 17 and 19 respectively, will flow into grooves, 9, 11 and 7 respectively, from which they will be picked up by the pumps and discharged into grooves, 8, 10 and 12 respectively, and thus out through the discharge openings, 14, 16 and 18, in the cover plate. The liquids may be introduced through the openings, 15, 17 and 19. by means of suitable pipes threaded therein, and discharged through pipes threaded into the openings, 14, 16 and 18.

By varying the angle of inclination of any cam plate to the axis of rotation, it will be apparent that the stroke of each pair of pistons may be varied `from zero up to the maximum. As the rotorrevolves. the conical pieces run on the cam plates andthe plungers are positively forced into the cylinders on the compression stroke and retracted from the cylinders by means of the helical springs on the vsuction strokes. The compression of these springs upon the bottom of the coun-- terbores will be suflicient to ho'ld the rotor tightly against the inner side of the front cover plate so that leakage will be avoided. To prevent compression in the counterbores I provide the vents. 59.

From the foregoing it will be apparent that I have provided a unitary pump which is adapted to draw and distribute a. plurality of different liquids at different rates. For example,where it is desired to feed oil, gasoline and water to an oil burner, these three liquids may be discharged at an rates into a common mixing device and 't e discharge of each liquid may be varied so that the proportion of the resulting mixture will be exactly as desired.

While I have described my invention in its preferred embodiment it is toIv be understood that the words which I have used are words of description rather than of limitation and that changes within the urview of the appended claims may be ma e without departing from' the true scope and spirit of my invention in its broadest aspects.

1. In a pump of the character described, the combination with a rotor having a plurality of pairs of reciprocatin pumps arranged in balanced relation ierein with their axis disposed parallel to the axis of the rotor but at different. distances therefrom, of means for independently varying the stroke of a pair of pumps.

' 2. In a pump of the character described, the combination with a' rotor having a plurality of airs of reciprocating pumps arranged in alanced relation therein with their axis disposed parallel to the axis of the rotor but at different distances therefrom, of an independent cam plate coacting with each balanced pair of pumps to control the strokes thereof.

of pairs of'reciprocating pumping u nits associated therewith in balanced relation and disposed at different distances therefrom,

of a plurality otcam plates -each coacting.

with a pair of pumps to control the strokes thereof, and means for varying the discharge of any pair of pumps independently of the others.

4. A pump of the character dbscribed, comprising a casing, a-rotor therein provided .with a plurality of cylinders arranged parallel to the axis of said rotor but at different distances therefrom,'plungers adapt ed to reciprocate in said cylinders and a plurality of concentrically arranged cams adapted to coact with said plungers for controlling tlie reciprocations thereof.

5. A pump of the character described com'- prising a casing, a rotor therein provided with a plurality of cylinders arranged in balanced pairs parallel to the axis of said rotor but at different distances therefrom, plungers adapted to reciprocate in said cyllnders, a separate camp ate inclined to the axis of the rotor and coacting with the plungers in each balanced pair of cylinders for controlling the strokes thereof, and means for independently varying the inclination of any cam plate.

6. In a pump of the character described,

the combination with a rotor provided with a plurality of sets of reciprocating ,pumpmg units disposed in balanced relation at Idifferent distances from the axis of said rotor, of means providing a separate supply and discharge passage for each set of units, whereby a plurality of different liquids may be simultaneousl pumped, and means for varying the discharge ot each set of units.

7. In a pump ofthe character described,

the combination with a rotor provided witha plurality of sets of reciprocating pumping units disposed in balanced relation lat different distances from lthe axis of said rotor, of means providing a separate supply and discharge passage for each set of units, Whereby a plurality of different liquids may be simultaneously pumped, and means for in dependently varying the discharge of each setof units.

8. A pump of the character described, comprising a casing, a rotor therein provided with a plurality of cylinders arranged parallel to the axis of said rotor but at different distances therefrom,plungers adapted to reciprocate in said cylinders, a plurality of cam plates normally inclined to the axis of said rotor and adapted to coact with said plu'ngers to effect a reciprocation thereof, and means for varying the inclination of said cam plates independentl of each other.

ARTHUR HELDON WELDY. 

